Construction for intermediate wall vent pipe



Aug. 2, 1960 s. EPSTEIN C'DNSTRUCTION FOR INTERMEDIATE WALL VENT PIPEFiled March 10, 1958 ill/ SA UL E PS TE IN! INVENTOR.

HERZ/G 8 JESSUPr ATTORNEYS.

CONSTRUCTION FOR INTERMEDIATE WALL VENT PIPE Saul Epstein, 2332Nottingham Ave., Los Angeles 27, Calif.

Filed Mar. 10, 1958, Ser. No. 720,239 4 Claims. (Cl. 126-307) Thisinvention relates to an improved triple wall vent pipe construction andparticularly to an improved lower end construction for an intermediatewall of a triple wall vent pipe for a pre-fabricated chimney.

The construction of the lower end of the intermediate pipe also is ofparamount importance for a safe and secure chimney installation becauseit is positioned near the hot inlet end of the inner or flue gas pipefor entry of the hot flue gases. In addition to being low in cost, thelower end construction of the intermediate pipe should provide openingsthrough its walls for the passage of air between the inside of the outerpipe and the inside of the intermediate pipe. Furthermore, therepreferably should be a minimum of contact between the intermediate andinner or flue gas pipe at their lower ends where the flue gas pipe isquite hot.

Accordingly, it is an important object of my invention to provide arugged and durable intermediate wall vent pipe construction at the lowerend thereof designed for rapid and efficient manufacture by the use oflow cost mass production methods, and equally eflicient and rapidassembly.

Another object is to provide a lower end construction for theintermediate wall of a triple wall vent pipe involving a minimum ofcontact between the intermediate wall and the flue gas pipe andcontaining openings for the passage of air between the inside of theouter pipe and the inside of the intermediate pipe.

A further object is to provide a safe and secure intermediate wallconstruction of low material and installation cost as part of apre-fabricated chimney designed to take the place of the conventionalbrick and mortar or masonry.

The objects of this invention include the provision of improvements inprior art constructions heretofore intended to accomplish generallysimilar purposes.

Additional objects will become apparent from the following description.

Stated in general terms, my invention comprehends an intermediate wallconstruction for a triple wall vent pipe wherein the intermediate wallcomprises a series of annular spaced slots, preferably cut through theintermediate wall near the lower end thereof, and having vertical wallmembers or portions between the slots to space the slots and support theintermediate wall above the slots, and radial members or portionsextending from the vertical members to space the outer wall of thetriple wall vent pipe from the intermediate wall.

A more detailed description of a specific embodiment of my invention isgiven below with reference to the drawing, wherein:

Figure 1 is a vertical sectional view showing the lower end of thetriple wall vent pipe including the intermediate wall constructionsupported on a hangar attached to a pair of adjacent joists;

Figure 2 is a cross-sectional view taken on line 2-2 of Figure 1 andshowing slots, vertical spacer members between the slots and radialmembers extending from the vertical members; and

Figure 3 is a perspective view showing the lower end of an intermediatewall construction including the slots, vertical spacer members andradial members.

In the specific embodiment of the intermediate wall construction shownin the drawing, slots 12 are cut through the wall of the intermediatepipe 13, as best shown in Figure 3. The slots 12 are spaced annularlyaround the lower end of the pipe 13 by suitable widths of vertical wallportions 14 to support the weight of the pipe above the slots.

A major portion of the wall material cut out in forming the slots 12 isremoved from the wall of pipe 13 by cutting through one end 15, an upperside 16, and a lower side 17, but the other end is not cut through.Instead, the three-sides cut-out material is bent outward radially fromthe pipe 13 along the uncut end 18, and cut off at the outwardlyprojecting end 19. The width of the resulting radial member 20 is madeequal to the intended spatial distance between the intermediate pipe 13and the outer pipe 21, as best seen in Figure 2.

The intermediate pipe 13, outer pipe 21 and inner pipe 22 can be made,for example, of about #28 gauge galvanized iron. It will be noted thatthe intermediate pipe is not joined to the outer pipe 21, inner pipe 22or hangar 10. This results in lower construction cost than in the caseof prior art constructions employing such joints, and at the same timeminimizes contacts over which an objectionable amount of heat transfer.takes place.

Any appropriate number of slots or openings 12 can be utilized withinpermissible limits of spacing.

Sometimes it is advantageous to have the spacers 20 engage at theiredges 19 only with an annular bead or abutment 25 provided in theintermediate pipe 13. Other times it is desirable to taper all or onlye.g., the lower ends of the edges .19 as at 26 so that the vertical oraxial insertion of the intermediate pipe 13 within the outer pipe 21 isfacilitated. Likewise in some instances it is preferable to notch theedges 19 as at 27 so that the same may act as a detent in cooperationwith the head 25 to position the intermediate pipe within the outer toinsure easier handling and more accurate assembly. Line contact of theedge 19 with the pipe 20 is thereby additionally achieved.

If desired, the spacing ears 20 can be turned both radially inwardly andradially outwardly to space the intermediate pipe from both inner andouter pipes. And, as required, the spacers can be formed anywhere alongany of the pipes, inner, intermediate or outer.

The formation of said spacers or ears 20 likewise as noted provides,without further cutting, forming or addition of materials or labor,suitable openings 12 in the intermediate pipe wall so that asatisfactory thermosyphoning flow of cooling air is circulabletherethrough. The capacity of said openings is easily sufiicient toaccommodate the full flow capacity of the interspaces between the outerpipe 21 and the intermediate pipe 13 on the one hand and between saidintermediate pipe 13 and the inner pipe 22, on the other. In addition,the spacers act as reinforcements to attain necessary vertical rigidityof the inter-opening wall portions or pillars 14.

When the pipes are otherwise suitably spaced at their lower ends in ahanger such as 10 a highly satisfactory and secure triple wall vent pipestructure results.

While I have herein shown and described my invention in what I haveconceived to be the most practical and preferred embodiment, it isrecognized that departures can be made therefrom within the scope of myinvention, which is not to be limited to the details disclosed herein,but is to be accorded the full scope of the claims so as to embrace anyand all equivalent structure.

Havingadescribed my invention, what I claim as new and desire to secureby Letters Patent is:

1. An intermediate wall construction for a triple wall vent pipecomprising a series of annularly spaced slot Wa qsiti ne r s iacent thewer. nd f e inter-l the-intermediate wall, the outer ends of said radialmemhers and said outer wall; having interlocking portions for lockingsaid intermediate and outer walls against relative e t itu na o emen 2-.Antintennediatel wall construction fora triple wall vent pipe comprisinga series of annularly spaced slots cptgthrough the intermediate Walladjacent the lower end thereof, vertical members integral-with theintermediate wall retained between theslots for spacing the slots andsupporting the intermediate wall adjacent the slots, radial membersintegral with the vertical members and extending, therefrom for spacingthe outer wall of the triple wall'ventpipe-lfrom the intermediate wall,the outer ends of said radial members and said outer wall havingresilient interlocking portionstor releasably locking said intermediateand outer walls against relative longitudinal movement.

3. An intermediate wall construction for a triple wall vent pipe comprsi g an intermediate wall having a plurality of circumferentially spacedslots cut there? through adjacent the lower end thereof, saidintermediate wall having vertical portions integral therewith betweenthe slots for spacing the slots and supporting the intermediate walladjacent the slots, said intermediate wall having integral radialmembers extending from the verti cal portions, said radial membershaving edge portions contiguously engaging the interior of the outerwall so as to space the outer wall from the intermediate wall, saidouter wall having a circumferential inwardly extending bead and saidradial memberseach having a notch in its edge engaged with said bead forholding the parts in position.

4. A method of fabricating a triple wall vent pipe constructioncomprising formingv circumferentially spaced cutouts in the lower partofthe intermediate pipe, the cutouts having a portion remaining integrallyattached to the intermediate -pipe, bending the material of'the cutoutradially outward from the material of the intermediate pipe, cutting offa portion of the material of the cutout at a point spaced from itsintegral attachment to the intermediate pipe, juxtaposing the outeredges of the remaining portions of the cutouts against-the interior of athird wall of the vent pipe. to space the, walls. apart,

forming a circumferential inwardly extending head in the lower part-,otthe outermost pipe, forming notches ,in the outer edges ,0f-,theradially extending remaining porticns oflthe c utouts apd fittingthesaidbead into'the said,

notches References Cited, in .the file of this patent UNITED STATESPATENTS Great Bri t ain Feb. 14, 1929

